Charles I of Austria Last monarch of Austria-Hungary (r. 1916–1918) (1887–1922) Parents Princess Maria Josepha of Saxony Archduke Otto of Austria Children Duchess Charlotte, Duchess of Mecklenburg-Strelitz Archduchess Adelheid of Austria Robert, Archduke of Austria-Este Archduchess Elisabeth of Austria Archduke Rudolf of Austria Otto von Habsburg Archduke Felix of Austria Archduke Carl Ludwig of Austria Siblings Archduke Maximilian Eugen of Austria Hilde Kuczor Alfred Joseph Edler von Hortenau Partners Zita of Bourbon-Parma
